Updated at 8:45 p.m. Sunday: Revised to include details from the vigil for the 11-year-old victim.

A father and son were found shot in an apparent murder-suicide in their Rowlett home late Saturday, police said.

Policarpo Gonzalez-Flores, 40, shot his 11-year-old son before killing himself, according to authorities.

Officers were called to the 5900 block of Mimosa Lane about 11 p.m., said Rowlett police spokesman Lt. David Nabors. When officers arrived, Gonzalez-Flores' body was in the entryway, and the boy was in a back bedroom. No one else was home at the time, he said.

Nabors said Gonzalez-Flores' wife, who is the stepmother of the 11-year-old, had been on the phone with her husband before she called 911. The two had been arguing about marital issues that night, Nabors said.

"He called her and said that he’d just shot his son, and the next thing she heard was a gunshot and the call ended," Nabors said.

James Gonzalez(Facebook)

The Dallas County medical examiner identified Gonzalez-Flores. The boy, James Gonzalez, died at Baylor Scott & White Medical Center at Lake Pointe.

Gonzalez-Flores' Facebook profile is covered in photos of James growing up and activities they shared together, including soccer. He referred to his son as "mini me."

More than 70 people gathered at a candlelight vigil Sunday night at Kenwood Heights Park in honor of James, a sixth grader at Coyle Middle School.

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Among those gathered were his stepmother, Stephanie Gonzalez, and his siblings: 19-year-old sister Alanna Bouvier and 20-year-old stepbrother Mike Lozano.

Bouvier called James "her best friend." She told the crowd a story about the day after Halloween, back when her brother was 3 or 4. James had dropped his candy on the floor, and the adults told him to pick it up or they would throw it away. The boy grabbed his favorite candy and left the rest on the floor.

"All right, I'm done," he said.

Bouvier laughed. She told friends and strangers that the funny stories were helping her navigate her grief.

Kimberlie Hawks, James' fourth and fifth grade teacher, told reporters that the boy was a straight-A student who was always well groomed and well behaved. He gave his teacher hugs after class and called to wish her a happy birthday.

James' father and stepmother went to parent-teacher conferences together.

"Not a red flag, ever," she said.

James Gonzalez and his father, Policarpo Gonzalez-Flores, wore matching jerseys in this 2011 photo.(Facebook)

Hawks' voice cracked as she described James, who spent a lot of time in the morning styling his mop of black hair.

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"James was Mr. Cool, you know," Hawks said. Girls in the crowd giggled as they wept.

One of his best friends, 12-year-old Cheyenne Magnuson, said James loved the Harry Potter books and had a crush on the character of Hermione.

He once had a crush on Cheyenne, too, said her mother, Stacey Milligan. James called Cheyenne one day in the fourth grade, but her oldest brother answered. James stuttered his way through the conversation and said he'd call again later.

Cheyenne brought a white cardboard sign to the vigil with the words "I LOVE YOU BUD!" scribbled on top.

Neighbors said the Gonzalezes kept to themselves and didn't cause any trouble. James was sometimes seen playing in the front yard with the family's two dogs.

A woman at the home of one of Gonzalez-Flores' relatives in Dallas declined to comment Sunday evening.

A small memorial is starting to form on the front step of 5913 Mimosa Lane in Rowlett, Texas Monday, May 7, 2018. Policarpo Gonzalez-Flores, 40, shot his 11-year-old son, James Gonzalez, before killing himself on Saturday, May 5, 2018, according to authorities. Gonzalez-Flores' wife, Stephanie Gonzalez, had been on the phone with her husband before she called 911. The two had been arguing about marital issues earlier that night. (Ron Baselice/The Dallas Morning News)(Ron Baselice / Staff Photographer)

Police said Gonzalez-Flores didn't have a violent history. He has no arrest record in Texas, according to the Texas Department of Public Safety.

Garland ISD counselors will be around to offer support to students and staff beginning Monday.

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"Our heartfelt sympathies are with this family and everyone at the campus who knew and loved this young student," district officials said in a statement. "He and his family are in our thoughts and prayers as they and our school community mourn this terrible loss."

Dana Branham, Breaking news reporter. Dana is a reporter at The Dallas Morning News covering crime and breaking news. She graduated in 2017 from the University of Oklahoma, where she studied journalism. Before coming to The News in 2018, Dana interned at the Cincinnati Enquirer and the Tulsa World.